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2 definitions found
 for Nostoc
From The Collaborative International Dictionary of English v.0.48 :

  Nostoc \Nos"toc\, prop. n. [F.] (Bot.)
     A genus of algae. The plants are composed of moniliform cells
     imbedded in a gelatinous substance.
     [1913 Webster]
  
     Note: Nostoc commune is found on the ground, and is
           ordinarily not seen; but after a rain it swells up into
           a conspicuous jellylike mass, which was formerly
           supposed to have fallen from the sky, whence the
           popular names, fallen star and star jelly. Also
           called witches' butter.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

  nostoc
      n 1: found in moist places as rounded jellylike colonies

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